Easy fifteen minutes walk from the last underground station haje on the red line. You pass remnants of soviet suburbs and end station but once you get to more recent flats it's very pleasant. Lake in extensive park. Suspect it's a reservoir as dam at the end. So nice to easily get to a swimming lake from central Prague try that in London! Spent three nice hours on a hot September day. Mainly young families. Choose between grass or sand. Lake was warm twenty one degrees and as expected a bit cloudy as sandy bottom. Other side was accessible by bike find your own private bay! I did not see too many topless women but would not have bothered me anyway 😊. Entry only sixty crowns. Soft drinks or really cheap beer available on the beach. Practical changing rooms. Didn't try toilets. Very pleasant 😊

Very crowded on a Sunday afternoon, but very good range of activities. Water was very clean considering its a dam. There could be better organised stall with food and drinks as it can take very long time to get served.